Phones are no longer just a tool to call and have become a small computer with a lot of possibilities. The organization of daily work is one of the most commonly used extra profits of phones. The maintenance of pet health is not an easy job. So, our work consisted of a development of a free android application that helps us cover a proportion of this requirement.The methodologies used for performing this work were user-centered design, in a way to obtain a more user-friendly software, and some elements of well know agile methodologies. This, particularly during development phase, help us release an usable software given the time we had available. As a result, we obtain a software ready for submission on a free and open software application store for Android. A basis for further working on the product, now, which potential help of others lovers of pets and free software. All this through the collaborative tools that Internet and technological innovations provide us and the practical benefits of open source.In conclusion, the development of this work has been helpful to see the importance of good planning when starting a new project, even with free software. We have learned to understand the documentation of new libraries and language codes we have used independently of our prior knowledge.